refactor(search): 优化搜索框的样式

Author: Light

src/css/nav.css

@@ -41,12 +41,10 @@
 .search-input {
   width: 100%;
   height: 50px;
-  line-height: 50px;
   font-size: 16px;
   color: #999;
-  border: none;
   outline: none;
-  padding-left: 45px;
+  padding: 0 45px;
   border: 1px solid #e6e6e6;
   border-radius: 10px;
 }